1 /* 2 * V9FS FID Management 3 * 4 * Copyright (C) 2005 by Eric Van Hensbergen <ericvh@gmail.com> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 8 * as published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to: 17 * Free Software Foundation 18 * 51 Franklin Street, Fifth Floor 19 * Boston, MA 02111-1301 USA 20 * 21 */ 22 23 #include <linux/list.h> 24 25 /** 26 * struct v9fs_dentry - 9p private data stored in dentry d_fsdata 27 * @lock: protects the fidlist 28 * @fidlist: list of FIDs currently associated with this dentry 29 * 30 * This structure defines the 9p private data associated with 31 * a particular dentry. In particular, this private data is used 32 * to lookup which 9P FID handle should be used for a particular VFS 33 * operation. FID handles are associated with dentries instead of 34 * inodes in order to more closely map functionality to the Plan 9 35 * expected behavior for FID reclaimation and tracking. 36 * 37 * See Also: Mapping FIDs to Linux VFS model in 38 * Design and Implementation of the Linux 9P File System documentation 39 */ 40 struct v9fs_dentry { 41 spinlock_t lock; /* protect fidlist */ 42 struct list_head fidlist; 43 }; 44 45 struct p9_fid *v9fs_fid_lookup(struct dentry *dentry); 46 struct p9_fid *v9fs_fid_clone(struct dentry *dentry); 47 int v9fs_fid_add(struct dentry *dentry, struct p9_fid *fid); 48